Disk drive to enable defect margining
View Patent ↗A disk drive is disclosed that enables defect margining during disk drive burn-in testing. The disk drive comprises: a disk comprising a plurality of tracks; a head actuated over the disk; and a processor. The processor is configured to: perform disk drive burn-in testing to detect media defects; generate an initial defect list based upon detected media defects for sectors; generate an extended defect list that includes detected media defects and extended defect margins from the detected media defects; and utilize the extended defect list for burn-in, wherein a spare area of the disk allows for the detected media defects and the extended defect margins.
1. A method to enable defect margining during disk drive burn-in testing comprising:
performing disk drive burn-in testing to detect media defects;
generating an initial defect list based upon detected media defects for sectors;
generating an extended defect list that includes detected media defects and extended defect margins from the detected media defects;
determining whether the extended defect list or the initial defect list is to be utilized for burn-in; and
utilizing either the extended defect list or the initial defect list for burn-in based on a result of the determination, wherein a spare area of the disk allows for the detected media defects and the extended defect margins when the extended defect list is utilized.
2. The method of claim 1 , wherein the initial defect list is utilized for burn-in if the spare area is not large enough to accommodate the extended defect margins.
3. The method of claim 1 , wherein the initial defect list is utilized for burn-in if generating the extended defect list exceeds a time threshold.
4. The method of claim 1 , wherein the initial defect list is utilized for burn-in if generating the extended defect list exceeds a size threshold for the extended defect list.
5. The method of claim 1 , wherein the extended defect margins include at least one of an adjacent cylinder sector or an adjacent wedge sector to the detected media defect for a sector.
6. The method of claim 1 , wherein the extended defect margins include a cylinder cluster end fill margin in which a cluster of detected media defects across a plurality cylinders are extended to include a plurality of other cylinders such that a larger cluster is formed to define the cluster end fill margin.
7. The method of claim 6 , wherein the extended defect margins include a cluster gap fill in which defect margins are extended between at least a pair of cluster end fill margins.
8. The method of claim 7 , wherein the cluster gap fill is approximately diagonally shaped.
9. The method of claim 1 , wherein the extended defect margins include a cylinder margin in which based upon one or more defects in a cylinder the defect margins are extended across the whole cylinder to define the cylinder margin.
10. The method of claim 1 , wherein the extended defect margins include a wedge cluster end fill margin in which a cluster of detected media defects across a plurality wedges are extended to include a plurality of other wedges such that a larger cluster is formed to define the wedge cluster end fill margin.
11. The method of claim 1 , wherein the extended defect margins include a wedge margin in which based upon one or more defects in a wedge the defect margins are extended across the whole wedge to define the wedge margin.
12. The method of claim 1 , further comprising pushing defective wedges down tracks such that the spare area of the disk allows for additional disk use area.
13. The method of claim 1 , further comprising thermal asperity padding wherein extended defect margins are generated from the detected media defects to compensate for thermal asperity.
14. A disk drive to enable defect margining during disk drive burn-in testing comprising:
a disk comprising a plurality of tracks;
a head actuated over the disk; and
a processor to:
perform disk drive burn-in testing to detect media defects;
generate an initial defect list based upon detected media defects for sectors;
generate an extended defect list that includes detected media defects and extended defect margins from the detected media defects;
determine whether the extended defect list or the initial defect list is to be utilized for burn-in; and
utilize either the extended defect list or the initial defect list for burn-in based on a result of the determination, wherein a spare area of the disk allows for the detected media defects and the extended defect margins when the extended defect list is utilized.
15. The disk drive of claim 14 , wherein the initial defect list is utilized for burn-in if the spare area is not large enough to accommodate the extended defect margins.
16. The disk drive of claim 14 , wherein the initial defect list is utilized for burn-in if generating the extended defect list exceeds a time threshold.
17. The disk drive of claim 14 , wherein the initial defect list is utilized for burn-in if generating the extended defect list exceeds a size threshold for the extended defect list.
18. The disk drive of claim 14 , wherein the extended defect margins include at least one of an adjacent cylinder sector or an adjacent wedge sector to the detected media defect for a sector.
19. The disk drive of claim 14 , wherein the extended defect margins include a cylinder cluster end fill margin in which a cluster of detected media defects across a plurality cylinders are extended to include a plurality of other cylinders such that a larger cluster is formed to define the cluster end fill margin.
20. The disk drive of claim 19 , wherein the extended defect margins include a cluster gap fill in which defect margins are extended between at least a pair of cluster end fill margins.
21. The disk drive of claim 20 , wherein the cluster gap fill is approximately diagonally shaped.
22. The disk drive of claim 14 , wherein the extended defect margins include a cylinder margin in which based upon one or more defects in a cylinder the defect margins are extended across the whole cylinder to define the cylinder margin.
23. The disk drive of claim 14 , wherein the extended defect margins include a wedge cluster end fill margin in which a cluster of detected media defects across a plurality wedges are extended to include a plurality of other wedges such that a larger cluster is formed to define the wedge cluster end fill margin.
24. The disk drive of claim 14 , wherein the extended defect margins include a wedge margin in which based upon one or more defects in a wedge the defect margins are extended across the whole wedge to define the wedge margin.
25. The disk drive of claim 14 , wherein the processor further pushes defective wedges down tracks such that the spare area of the disk allows for additional disk use area.
26. The disk drive of claim 14 , wherein the processor further performs thermal asperity padding wherein extended defect margins are generated from the detected media defects to compensate for thermal asperity.